What Are the Product Testing Standards of GRC Manufacturers? A Complete Overview of National and Industry Standards

"What are the product testing standards of GRC manufacturers?" This is a core question in the project selection and acceptance stages. Clear testing standards are the basis for measuring GRC product quality and the key to ensuring project quality. At present, GRC product testing in China mainly follows relevant national and industry standards, covering multiple stages including raw materials, finished product performance, and construction and installation. As an industry leader that has participated in the formulation of multiple GRC standards, Qinglong Group provides a comprehensive overview of the core testing standards for GRC products and explains their key requirements, helping you better control product quality.

Core basic standard: "Glass Fiber Reinforced Cement (GRC) Decorative Products" JC/T940-2022. This is the core industry standard for GRC decorative products, replacing the previous version, and provides comprehensive provisions on the technical requirements, test methods, and inspection rules of GRC products. The standard specifies raw material requirements for GRC products, such as a zirconia content of no less than 16% for alkali-resistant glass fiber, and cement must be Portland cement or ordinary Portland cement with a strength grade of no less than 42.5. In terms of finished product performance, it specifies key indicators such as flexural strength, tensile strength, impact strength, water absorption, and drying shrinkage, with flexural strength ≥15MPa and impact strength ≥3.0kJ/m². For appearance quality, the product surface must be free of obvious defects such as cracks, air bubbles, and chipped edges or corners, and dimensional deviations must fall within the specified range. As a major contributing unit in the revision of this standard, Qinglong Group strictly organizes production and testing in accordance with its requirements, and all GRC products meet every indicator of the standard.

Application technical standard: "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" JGJ/T423-2018. This standard focuses on the application of GRC products in building engineering, covering the full-process requirements of design, production, construction, and acceptance, and serves as an important basis for quality control of GRC projects. The standard provides detailed provisions on the design calculation, connection construction, fire protection design, and anti-corrosion design of GRC components; for example, the design service life of GRC components shall be no less than 25 years, and connection joints shall have sufficient load-bearing capacity and durability. For construction, it specifies requirements for the transportation, storage, installation processes, and quality control of GRC components. For acceptance, it clarifies acceptance criteria for dominant items and general items, such as verticality and flatness deviations of installed components. Qinglong Group was deeply involved in the formulation of this standard, and in projects such as the Wuhan Han Show Theatre and the Hainan International Convention and Exhibition Center, design and construction strictly followed the standard requirements to ensure project quality compliance.

Specialized performance standards: GRC products with specific functions must follow the corresponding specialized testing standards. For example, GRC panels used on exterior walls must comply with the "Standard for Quality Acceptance of Building Curtain Wall Engineering" GB/T50210-2018 and be tested for wind pressure resistance, water tightness, air tightness, and other properties; for projects with high fire protection requirements, GRC products must comply with the "Classification for Burning Behavior of Building Materials and Products" GB8624-2012 and be tested for their burning performance grade to ensure they meet the Class A non-combustible standard; GRC products used for interior decoration must comply with the "Standard for Indoor Environmental Pollution Control of Civil Building Engineering" GB50325-2020 and be tested for environmental indicators such as formaldehyde, benzene, and radioactivity. Qinglong GRC products undergo targeted specialized testing according to their application scenarios—for example, indoor GRG products strictly control formaldehyde emissions, while exterior wall GRC panels pass specialized tests for wind pressure resistance, water tightness, and more—meeting the functional requirements of different projects.

Internal enterprise control standards: High-quality GRC manufacturers establish internal control standards that exceed national standards to further improve product quality. Internal control standards typically impose stricter requirements on raw material screening, production processes, and finished product testing to ensure product stability and reliability. Qinglong Group has established a comprehensive internal control standard system: in raw material testing, it has added testing of the alkali resistance retention rate of alkali-resistant glass fiber; in the production process, it has set more precise batching ratios and curing parameters; in finished product testing, it has added items such as accelerated aging tests for long-term durability. These internal control standards are far stricter than industry standards, providing double assurance for product quality.

GRC product testing standards are the "lifeline" of product quality; whether for manufacturer production or project acceptance, national and industry standards must be strictly followed. As a participant in GRC standard formulation, Qinglong Group always holds itself to high standards—all products pass the various tests specified by the standards, while internal enterprise control standards further enhance quality. Understanding these testing standards helps project managers better carry out product selection and acceptance, ensuring that selected GRC products are of qualified quality and compliant in application, providing strong assurance for project safety and aesthetics.